Filter panel with zig-zag corrugations



g- 1956 .1. K. BRIXIUS 2,760,597

FILTER PANEL WITH ZIG-ZAG CORRUGATIONS Filed Aug. 19, 1955 INVEN TOR.Jhcoa A. Bmx/ 06 FILTER PANEL WlTl-l ZlG-ZAG CORRUGATIONS Jacob K.Brixius, Cleveland, Ohio, assignor to Air-Maze Corporation, Cleveland,Ohio, a corporation of Beta ware Application August 19, 1953, Serial No.375,162

11 Claims. (Cl. 183--69) This invention relates to improvements in afilter panel for ltering particles out of a gaseous stream.

One of the objects of the present invention is to provide a filter panelfor removing entrained particles from a gaseous stream, wherein aplurality of generally parallel contiguous sheets of filter material areplaced in a frame extending in the general direction of stream fiowthrough the frame. Each of these sheets has parallel corrugationsextending from the front face to the rear face of the panel, thecorrugations of one sheet crossing the corrugations of the adjacentsheets in non-nesting relation. Each of these corrugations has a sharpbend inte t the front and rear faces of the panel and the L sentinvention relates to the positioning of these COllLlgctlOll bends ofone-half of the sheets in the panel a fixed distance from one face ofthe panel while the corrugation bends of the alternate sheets of thepanel are placed at a different fixed distance from the face of thepanel.

Another object of the present invention is to provide a panel of typedescribed above whether or not the same is permanently mounted in aframe. In other words, the making of such a panel of disposable materialsuch as paper, all of the sheets of which are firmly secured to eachother and the finished panel being trimmed to a regular shape perimeteradapted to fit into a holding frame of corresponding perimeter. In sucha case, the holding frame is a part of a permanent installation and thedisposable panel can be removed from the permanent holding frame whenthe panel becomes dirty and replaced by a clean panel.

A further object of the present invention is the provision of a panel ofthe type described above and made of disposable material such as paperand mounted in a permanent substantially rigid frame individual to thepanel but having a removable portion through which the disposablematerial of the panel may be extracted and a new panel substituted. Inthis case, the container frame for each individual panel is practicallypermanent while the filter material is disposable.

A further obiect of the present invention is the provision of a panel ofthe type above described formed of disposable material such as paper andhaving around it an individual panel frame of paper-like materiallaminated with a metallic foil on the outside faces of the frame. Inthis case, when the disposable panel is treated with a viscous adhesive,the adhesive will not come through the metalli foil covering the frameand protects the hands and clothes of the user against soiling. A stillfurther object of the present invention is the provision of a filterpanel of sheet material wherein the layers are secured together andterminate in a perimeter of predetermined shape, there being a slotprovided intermediate the front and rear faces of the panel andextending continuously along at least two opposed sides of the panel,said slot extending from an edge of the panel inwardly, together with astrip of flexible sealing material held in the slot and extendingoutwardly beyond the edge ates Patent Patented Aug. 28, 1956 of thepanel so that the strip of sealing material prevents the passage of thegaseous stream between the edge of the panel and a surrounding frame.

Other objects and advantages of my invention will be apparent from theaccompanying drawings and description and the esssential featuresthereof will be set forth in the appended claims. In the drawings Fig. 1is a pen spective view of a filter panel embodying my invention.

Fig. 2 is an enlarged fragmental sectional view taken along the line 2-2of Fig. l and showing somewhat diagrammatically the arrangement of thecorrugations in the various layers of a filter constructed according tomy invention.

Fig. 3 is a fragmental sectional view similar to Fig. 2 and showinganother modified form of my invention.

Fig. 4 is a transverse sectional view similar to Figs. 2 and 3 andshowing still another modified form of my invention.

Fig. 5 is a perspective view of a fragment of a sheet of imperforatematerial corrugated for use in my invention.

Fig. 6 is a perspective view of a fragment of a sheet of foraminousmaterial corrugated for use in my invention.

Fig. 7 is a fragmental sectional view similar to the right-hand end ofFig. 2 and illustrating the use of a novel sealing strip and alsoillustrating the construction of the frame using paper laminated withmetal foil, while Fig. 3 is a perspective View of a modified form ofpanel wherein a permanent substantially rigid frame is provided having aremoval portion through which the panel may be extracted and a new panelsubstituted.

Filters have been made heretofore of a general character similar tothose herein disclosed, but with a difference which will be hereinafterpointed out. My invention is applied to filter panels wherein aplurality of generally parallel sheets of filter material extend in thegeneral direction of stream flow so that the how of the gaseous streamthrough the filter panel is in general along the sheets of filtermaterial rather than through them. One manner of constructing such afilter is shown in Fig. 1 wherein a generally imperforate frame 10 ofrectangular form is made up of material which is channel form in sectionas clearly shown in Fig. 2. Sheets 11 of filter material are piled oneon top of the other in the frame 10 until the frame is full, generally,the fourth side of the frame being left open for this purpose and thenthe last side is secured in position after the frame is filled.

My invention is applied by utilizing sheets of filter material such asshown in Figs. 5 and 6. Fig. 5 shows imperforate material which aresheets of heavy paper or metal or of metal foil. Fig. 6 shows foraminousmaterial which might be the material of Fig. 5 perforated, butpreferably is of screen mesh material corrugated 'as shown. It will beunderstood by those skilled in this art that it is difficult to clearlyshow the. corrugated ma terial in perspective as viewed in Figs. 5 and6, but these figures will be understood by reference to Figs. 3 and 4showing a 2 form of corrugation which is that form which I haveattempted to show in Figs. 4 and 5. In such a corrugation, a longer legof the Z shape is indicated at 12 with shorter legs at 13 and 14. Thebend between the legs 12 and 13 has been indicated at A and that betweenthe legs 13 and 14 has been indicated at B. The same construction isillustrated in screen mesh material in Fig. 6 and therefore these samereference characters have been applied therewith a prime suffix. Thoseskilled in this art will understand that such corrugations might haveonly a single bend as shown in Fig. 2.

In the prior art, as illustrated by U. S. Patent 2,567,030 grantedSeptember 4, 1951, to Oliver H. Schaaf, it was customary to place thebends in the corrugations of one layer substantially directly inregistration with the bends of the adjacent layers. I have discoveredthat if these bends are staggered as shown in Figs. 2, 3 and 4 improvedefliciency results.

Referring now to Fig. 2, a corrugation of V form is shown having alonger leg l5 and a shorter leg 15 with the bend indicated at C. Theview in Fig. 2 is broken away to show how the alternate layers arereversed in position so that in a first layer (toward the left in Fig.2); the longer leg 15 is toward the front of the panel, then in thesecond layer next below it, the shorter leg 16 is toward the front ofthe panel and the longer leg toward the rear, then in the next layerbeneath that the arrangement is as in the first one and the next layerbeneath that is arranged as in the second one. This construction isfollowed through the panel. "Thus, it will be seen that the bends -.C ofone-half of the layers of filter material lie at a fixed distance D fromthe front face of the panel, while the bends of the other alternatelayers of the panel lie along a second line which is at a differentfixed distance E from the front of the panel.

Another form of my invention is shown in Fig. 3 wherein 2 formcorrugations somewhat like that shown in Figs. 5 and 6 are placed withthe longer leg 12 toward the front of the panel at the left in Fig. 3and the shorter legs 13 and 14- toward the rear of the panel. Then inthe next layer beneath it, the shorter legs are at the front of thepanel and the longer leg is toward the rear of the panel. he next layerbeneath that is like the first described layer and the next layerbeneath that, at the right in Fig. 3, is like the second describedlayer. In this form of my invention the longer leg 12 of the 2 formcorrugation is longer than the two legs 13 and 14 combined so that theposition of the bends A and B of one layer is opposite the longer leg 12of the layer on each side thereof. Here it is obvious that the bends Aand B of one-half of the layers of filter material (the first and thirddescribed) lie along lines parallel to the front face of the panel butat a greater distance therefrom than the lines along which the bends Aand B of the alternate layers lie (the second and fourth layersdescribed).

In Fig. 4 I have shown another form of my invention wherein the firstlayer shown at the left in Fig. 4 is identical with the same layer ofFig. 3, the second layer moving toward the right and next below thefirst layer is like the firs-t layer with the screen turned in reverseposition, but with the longer leg 12 of the Z shaped corrugations cutoff to give a shorter leg indicated at 12a. The next layer below this,the third one in Fig. 4 is like the first described and the next layerbelow that, the fourth one toward the right in Fig. 4 is like the seconddescribed layer. This again places the bends A and B of the first andthird layers lying along lines parallel to the front face of the filter,but at a greater disance therefrom than the lines along which the bendsA and B of the alternate layers 2 and 4 lie. The filter of Fig. 4 issimilar to that described and claimed in my copending application SerialNumber 375,122, filed August 19, 1953, for Edge Filter Panel with UnevenFace.

The improved construction here shown in Figs. 2, 3 and 4 has a markedlyhigher efiioiency than the older constructions shown in the abovementioned Schaaf patout. I believe this improved eflieiency is due tothe fact that turbulence occurs at the bends A and B of Figs. 3 and 4 orat the bends C of Fig. 2. By having these bends at different points withrespect to the front of the panel in the a e na layers o the Pan I e ethat I provide a greater turbulepce of the gaseous stream passns t rou hth panel and ha h s m is u m e tin pusly sti up n s pa a e h h h pa thanis true in the above-mentioned Schaaf panel. In any case, I find that myimproved panel as shown in Fig. l ap ure abo 22 o the d r h c oul Pas thou t e con truction s a in Fi o t e a o utsufinmd S h-ear Pate t m te tas mad w th foraminous screen mesh material of the same character ineach case.

In Fig. 7 I have shown a form of seal which may be applied to the formsof the filter here shown or, indeed, to any filter composed of layers offilter material which are intended to be assembled in a surroundingframe.

Fig. 7 shows a portion of a filter constructed according to Fig. '2, thelayers 11 and 11a being shown as alternately turned in oppositedirections although other arrangements of filter material arecontemplated. The filter is surrounded by a frame 17 which is shown insection in Fig. 7 as being generally of channel form and which it willbe understood by those skilled in this art completely surrounds thefilter panel around the perimeter thereof. Intermediate the front andrear faces of the panel a slot 18 is cut extending continuously along atleast two opposed sides of the panel, and preferably, in many cases,around the entire perimeter of the panel. The reason I mentioned thelimitation of along at least two opposed sides of the panel is becausesome sheets of panel material give a good seal along two opposed sidesof a rectangular frame such as that shown in Figs. 1 and 8 but give arather poor seal along the other two opposed sides of the rectangle. Anuninterrupted strip 19 of flexible sealing material is inserted in theslot 18 and preferably is a snug fit in the slot so that it is heldtherein. The sealing strip extends outwardly beyond the outer edge ofthe filter panel so as to be in position to engage the web of the frame17 in a manner to seal the opening there between the panel and frameagainst the leakage of any gaseous stream around the right-hand edge ofthe filter panel as seen in Fig. 7.

One form of sealing strip is made of usual felt mate rial used forsealing purposes. Another and preferred form of sealing strip is made oflaminated tissue or wadding paper. Such a laminated paper structure issold under the trade name of Kimpak.

Fig. 7 illustrates another improvement which may be utilized inconnection with my invention. Where the panel is made of disposablematerial such as paper, and where the frame is also made of paper asillustrated in Fig. 1, the filter panel is often coated with a viscousadhesive so as to cause the dirt particles to adhere more easily andmore efiiciently to the filter material. In such a case, the viscousadhesive works through the paper frame 10 of Fig. l and soils theclothes and hands of the user. In Fig. 7 I have illustrated a frame 17which is made of paper laminated with a metal foil 17a on the outsidesurfaces thereof. It results from this construction that while the mainpaper portion 17 of the frame may become coated with viscous adhesiveand impregnated with viscous adhesive and impregnated therewith clearthrough the paper, nevertheless, the metal foil 17a is impervious to theviscous adhesive, which quite often is oil, and therefore the outersurfaces of the frame re main clean for handling.

Another manner of utilizing my invention is illustrated in Fig. 8 Herethe frame 20 may be of channel form metal or other rigid material aspreviously described with the corners 21 and 22 permanently fixed inposition, but with the corner 23 left non-rigid so that it may provide ahinging action as illustrated in the movement of the top panel 20a fromthe full line position to the dot-dash position of Fig. 8. When thefilter is first made the top panel {2041 is moved downwardly after allof the filter elements are in place and the bolt or other means 24 holdsthe free end of the side 20:: to the adjacent side so as to maintain theframe in its rectangular condition. When the filter is to be servicedthe bolt or other securing means 24 is removed, the panel 29a is movedto its dot-dash position or higher, sufiieiently to permit the removalof the filter element 25 from the frame. This filter element maypreferably be made of paper or other disposable material so that it isthrown away when dirty and a new clean element placed in the frame 20.The fourth side 20a is then closed down again to the full line positionand fastened with the bolt or securing means 24. In this fashion, I makeit possible to utilize the frame 20 over and over again While the filterelement 25 may be thrown away and replaced each time it becomes dirty.

Still another manner of utilizing my invention, is to secure all of thesheets of the filter element together and trim it or build it so that ithas a perimeter of predetermined contour so as to fit into a permanentholding frame. Those familiar with this industry will understand that aframe like or 20 is normally slipped into a holding frame and held thereby means of clips or other removal securing means. Instead of providingthe individual frames 10 or 20 for each filter panel, I may trim thefilter element itself to the shape of the holding frame so that it maybe pushed into position and held there by any suitable means and thenthrown away when the filter becomes dirty. In a preferred form of myinvention, Where the filter is made up of paper or the like aspreviously described, these layers may be permanently secured to eachother by a strong adhesive so that the entire filter panel becomes asingle block which may be trimmed to the desired shape and handled in amanner above indicated.

What I claim is:

1. In a filter panel for removing entrained particles from a gaseousstream and having front and rear faces and frame means compelling streamflow through said panel from the front face to the rear face, aplurality of generally parallel contiguous sheets of filter materialextending in the general direction of stream flow, each of said sheetshaving parallel corrugations extending from the front face to the rearface of said panel, the corrugations of one sheet crossing thecorrugations of adjacent sheets in non-nesting relation, each of saidcorrugations having a bend between the front and rear faces of saidpanel and the corrugation bends of one sheet being at a substantiallydifferent distance from a given face of the panel with respect to anycorrugation bends of the adjacent sheets on each side of it.

2. The combination of claim 1 wherein said sheets are of substantiallyimperforate material.

3. The combination of claim 1 wherein said sheets are of foraminousmaterial.

4. The combination of claim 1 wherein said sheets are of foraminousscreen mesh material.

5. The combination of claim 1 wherein said corrugations are generally Zform with one leg of said 2 being longer in a fore-and-aft directionthan the other two legs combined, whereby said two shorter legs of onesheet will lie opposite the long leg of sheets on opposite sidesthereof, all of said sheets being uniformly corrugated and alternatesheets being turned upside down when assembled in said panel.

6. In a filter panel for removing entrained particles from a gaseousstream, a plurality of generally parallel contiguous sheets ofdisposable material such as paper extending in the general direction ofstream flow, each of said sheets having parallel corrugations extendingfrom the front face to the rear face of said panel, means maintainingsaid sheets in non-nesting relation, a frame of paper-like materialcompletely surrounding the perimeter of said panel, said frame beinglaminated with a metallic foil layer on the outside faces thereof,whereby when said panel is treated with a viscous adhesive, said foilprotects the user from contact with said adhesive.

7. A filter panel for removing entrained particles from a gaseous streamcomprising a filter element, a frame completely surrounding theperimeter of said filter element and substantially in engagementtherewith, there being a slot intermediate the faces of said panelextending into said panel from an edge thereof and a strip of flexiblesealing material held in said slot and extending outwardly therefrombeyond the edge of said panel, said strip engaging the interior face ofsaid frame whereby to seal against leakage along the edge of said panelwhere it is adjacent said frame.

8. The combination of claim 7 wherein said flexible sealing stripextends substantially continuously, completely around the perimeter ofsaid panel.

9. The combination of claim 7 wherein said sealing strip comprises aplurality of laminated layers of tissue paper.

10. The combination of claim 7 wherein said sealing strip is of felt.

11. In a filter panel for removing entrained particles from a gaseousstream and having front and rear faces and frame means compelling streamflow through said panel from the front face to the rear face, aplurality of generally parallel contiguous sheets of filter materialextending in the general direction of stream flow, each of said sheetshaving parallel corrugations extending from the front face to the rearface of said panel, said corrugations being generally inclined relativeto the face of said panel, the corrugations of one sheet crossing thecorrugations of adjacent sheets in non-nesting relation, each of saidcorrugations having a sharp bend between the front and rear faces ofsaid panel, the corrugations of every other sheet having their bendslying along a line substantially parallel to the front face of the panelat a fixed distance therefrom, and the corrugations of the others ofsaid sheets having their bends lying along a line substantially parallelto the front face of the panel and at a different fixed distancetherefrom, whereby the corrugation bends of one sheet are at asubstantially different distance from a given face of the panel withrespect to any corrugation bends of the adjacent sheet on each side ofit.

References Cited in the file of this patent UNITED STATES PATENTS2,118,271 Slayter May 24, 1938 2,286,479 Farr June 16, 1942 2,408,659Lamb Oct. 1, 1946 2,555,125 Gregory May 29, 1951 2,567,030 Schaaf Sept.4, 1951 2,653,676 Breckheimer Sept. 29, 1953 2,687,781 Sens Aug. 31,1954

